RTC board

https://github.com/MiSTer-devel/Main_MiSTer/wiki

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cvenditti
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Re: RTC board

Postby cvenditti » Thu May 17, 2018 3:10 pm

Arrow have the AD7415ARTZ-0500RL7 for $2
https://www.arrow.com/en/products/ad741 ... asheets360

I'm ready to order 10. That will boost the price of the RTC from $14 to $16 but I think people will be happy to monitor the temp.

I know it is definitely not a priority but do you have a time frame for the temp. monitor implementation?

Thank you
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Re: RTC board

Postby Sorgelig » Thu May 17, 2018 7:23 pm

As soon as i will have time for this and overall picture how it should work.
Actually, this feature is not even announced. Placement of sensor is not so good as it has no direct contact to FPGA chip. So, the measurement won't reflect actual temperature and will be affected by environment and even airflow direction where sensor will show 20C while real FPGA chip has 70C. Thus it cannot be taken in account when you judge the chip heating.
You need to create a compatible environment to make measurement somehow reflect the actual chip temperature.

So, this whole complexity stops me from offering temperature measurement function. Users will relay on this while it may not reflect the actual temperature.

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Re: RTC board

Postby Frederir » Thu May 17, 2018 9:51 pm

What about using a NTC and an I2C ADC ? The NTC could be put on the FPGA's heatsink and connected to the board with wire ? MCP3021A0T is cheap and 10 bits should give an adequate resolution for the temperature.

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Re: RTC board

Postby Sorgelig » Fri May 18, 2018 2:52 am

What is NTC? Some thermal conductor? Post the links, please.

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Re: RTC board

Postby Frederir » Fri May 18, 2018 6:57 am

https://en.wikipedia.org/wiki/Thermistor
NTC for 3D printer extruder can be get for really cheap :
https://www.gearbest.com/3d-printer-par ... id=1433363

Of course it must be fixed to the FPGA heatsink one way or another. Epoxy glue is easy.

F.

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Re: RTC board

Postby Sorgelig » Fri May 18, 2018 7:12 am

I know what is thermistor. Just didn't know the NTC abbreviation.
It's not more convenient than AD7415. You can glue this chip directly to heatsink. I think it's possible to move the heatsink toward the RTC board with one rib precisely trimmed so it will touch the chip from the bottom and thus provide the heatsink temperature.

But either way is for advanced users only.

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Re: RTC board

Postby warham » Sat Nov 03, 2018 11:56 am

3d printed standoff for the rtc board
https://www.thingiverse.com/thing:3193029

Image

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Re: RTC board

Postby Sorgelig » Sat Nov 03, 2018 5:09 pm

warham wrote:3d printed standoff for the rtc board

May be it's better to improve it by preventing RTC board from bending up as well. With I/O board it's actual.

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Re: RTC board

Postby warham » Sun Nov 04, 2018 7:17 pm

Sorgelig wrote:
warham wrote:3d printed standoff for the rtc board

May be it's better to improve it by preventing RTC board from bending up as well. With I/O board it's actual.





something like this?
Image

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Re: RTC board

Postby Sorgelig » Sun Nov 04, 2018 7:24 pm

Yeah! looks good! supports both I/O board and RTC.

Although i've bought 3D printer some time ago, i still didn't try it. May be it's time to try :)

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Re: RTC board

Postby SmokeMonster » Mon Nov 05, 2018 1:38 am

Great work Warham! I wrote that up for RetroRGB http://retrorgb.com/mister-3d-supports-for-io-rtc-boards.html. Should be in Wednesday's Roundup unless he's filmed already.

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Re: RTC board

Postby diggie » Tue Nov 13, 2018 4:18 am

Edit: Nevermind, just noticed hwclock command is documented for testing.

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Re: RTC board

Postby Poobah » Sat Dec 01, 2018 4:02 pm

I'm building some RTC 1.3 boards.
Debating on whether to populate the temp sensor, as it drives the board cost up significantly.

Any thoughts on when/if the sensor will supported? My thought now is NOT to populate it, so people can have a less expensive clock option.

Thanks!
MiSTer Expansion Boards, USA Seller: IO, SDRAM (32, 64, 128), RTC, USB, Audio Input & Accessories)
http://www.legacypixels.com/mister

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Re: RTC board

Postby Sorgelig » Sat Dec 01, 2018 4:07 pm

don't populate

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Re: RTC board

Postby bitfan2011 » Sat Jan 05, 2019 7:07 am

So which cores currently require the RTC board?

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Re: RTC board

Postby widge » Sat Jan 05, 2019 8:09 am

bitfan2011 wrote:So which cores currently require the RTC board?


According to the wiki, no core requires the RTC board but it is supported on the following cores:

    ao486
    BBC Micro Master 128K
    Minimig
    MSX
    TSConf
https://github.com/MiSTer-devel/Main_Mi ... orting-RTC

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Re: RTC board

Postby djmartins » Tue Jan 29, 2019 10:04 pm

bitfan2011 wrote:So which cores currently require the RTC board?


and it isn't required, those cores can use it if you have one....

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Re: RTC board

Postby Sorgelig » Wed Jan 30, 2019 1:11 am

With Internet connection you don't need RTC. Just wait several seconds till you get the time in menu core.

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Re: RTC board

Postby ooraka » Thu Oct 17, 2019 2:21 pm

Hey folks, maybe you can help me. I got two RTCs and when I connect them to the DE10 I can set the time via hwclock -wu and then hwclock -u shows the correct time. I use CR1220 3V lithium batteries, facing the correct way, but when I turn the MiSTer off and remove the WiFi dongle before turning back on, then there is no time and hwclock -u shows an invalid argument.

Is there something I am missing and can I test if the RTC is powered correct? To me it looks like both RTCs I tried are not powered by the batteries and I tried multiple Maxell and Panasonic brand batteries.

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Re: RTC board

Postby Sorgelig » Thu Oct 17, 2019 5:47 pm

According to your description, you doing everything right.
Probably RTC board is broken. Contact the seller.

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Re: RTC board

Postby Threepwood » Thu Oct 17, 2019 7:32 pm

Yeah, sounds like that is in order. Here it works this way.

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Re: RTC board

Postby ooraka » Thu Oct 17, 2019 7:52 pm

Okay, thank you!


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